Peter stoltz



P. STOLTZ.

THE FEEDING 0F FUEL T0 INTERNAL COMBUSTION ENGINES. APPLICATION FILED .IUNE26| 1912.

I 9 1 9 YQ, Patented Aug. 15, 1916.

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PETER STOLTZ, OlF BERLIN, GERMANY.

THE lFEEING 0F lFUlEL T0 INTERNAL-COMBUSTION ENGINES.

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Specification of Letters Patent.

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Application tiled June 26, 191,2. Serial No. 705,900.

To all 11i/0m t may concern:

lie it known that ll, PETER STOLTZ, a subjcct of the German Emperor, residing at lllafenplatz 8, Berlin, Germany, engineer, have invented certain new and useful lmprovements in and Relating to the .Feeding of Fuel to internal-Combustion Engines, of which the following is a specification.

rllhe present invention has for its object an internal combustion engine operating with liquid fuel in which in the known mannerI the fuel is sprayed into the combustion air which has been compressed at least in part.

'lf he invention has for its object to adapt engines of this kind for high speeds of rotation such as are necessary for driving vehicles.

'.lhe internal combustion engines in which the fuel is sprayed in as hitherto known can only attain high speeds with difficulty mainly because unless special measures are taken the flow of fuel is interrupted in the suction pipe of the fuel pump owing to the great acceleration at the beginning of each suction stroke so that thel fuel pump ceases to furnish its supply. ln other words, the pump when exceeding a critical speed is unable to suck into thc pump chamber the required charge of liquid fuel during the extremely short time interval between successive fuel delivering strokes of the pump piston. Un.

the other hand owing to the high piston speed of the fuel pump the injection produced by its pressure stroke is not sufficiently controllable so that in practice it is necessary to have recourse to the atomizing of the fuel by compressed air which is not a desirable auxiliary means. lin accordance with the invention these difficulties are overcome owing to the fact that anumber of fuel pumps are' provided for one motor cylinder; these pumps are connected in parallel and deliver in succession to supply the fuel so that, for example, if three fuel pumps are used each of these pumps injects fuel into the engine cylinder once only during three power strokes of the engine piston and each pump piston makes only one-third the strokes that would be necessary if but one pump were provided. rllhis permits each pump to have approximately three times the amount of time to suck in its charge andthus proper charges are insured and regulation of the charge rendered less difficult.

llt is advantageous to provide for each pump at least one special injection valve on the combustion cylinder so that the injection valves operate in succession and the difticulties hitherto arising owing to the high speed of operation of the injection valve are avoided.

'lfhe drawing is a diagrammatic plan of two different arrangements of the fuel pumps.

ln Figure l each of the two fuel pumps e cooperates with a separate injection member (atomizinw valve) I) on the cylinder a while in Fig. 2 goth the pumps deliver to one and the same injection member. lin both cases each fuel pump need only effect one operative stroke for every two cycles in the motor cylinder'.

As already stated in some cases the arrangement shown in lFig. l is considerably more advantageous because here each valve o runs at only half the speed of the valve b in Fig. 2.

The motor canbe regulated for example by means of a throttling member It arranged in front of the fuel pumps and arranged in the common fuel supply pipe g or by means of a plurality of throttling members which are distributed on the branch lpipes leading to the several fuel pumps.l This regulation acts in such a manner that according to the throttling of the member l1, only a portion of the stroke volume of the pump is filled with fuel. Upon the retractive stroke of the pump piston the vacuum is first compensated for and then toward the end of the stroke, thel quantity of fuel drawn in which is determined by the throttling is delivered into the combustion chamber. A

What l claim and desire to secure by lLetters Patent of the United States is:

1. [t high speed internal combustion engine of the Diesel type having a combustion chamber, a plurality of liquid fuel pumps operated by said engine and delivering to said chamber in succession, each of said pumps serving to supply the liquid fuel for a separate power stroke of the engine piston, and independentlycontrollable valves for separately regulating the admission of liquid fuel to each of said pumps. y

2. A high speed internal combustion engine, of the Diesel type, having a combustion chamber provided with a plurality of separate liquid fuel inlets, a plurality of liquid fuel pumps operated by said engine and delivering from the same source of supply to said chamber and in succession, each of said pumps delivering through a separate inlet and serving to supply the liquid fuel for a separate power stroke of the engine piston, and controllable valves for regulating the admission of liquid fuel to each of said pumps.

In testimony whereof I aix my signature in presence of two. witnesses.

PETER STOLTZ.

Witnesses lVoLoEMAn HAUPT, HENRY HASPER. 

